NPK Granulation Process Design for Complex Formulations: Anti-blocking, Return Material Control, and Thermal Integration
A complete NPK granulation process typically includes the following steps: raw material crushing → batching and mixing → granulation → drying → cooling → sieving → coating → packaging. Granulation is the core process, directly determining the particle strength, particle size distribution, and appearance quality of the finished product. After crushing and mixing, the raw materials form a mixture with a certain degree of homogeneity, which is then fed into a granulator. Inside the granulator, the material is formed into granules through rolling agglomeration (wet process) or high-pressure extrusion (dry process). The wet granules or extruded fragments exiting the granulator are dried to remove excess moisture (required in the wet process, omitted in the dry process), then cooled, and finally, qualified granules are sent to the coating and packaging stage via a sieving machine. Fine powder and large particles produced during sieving are returned to the system for reuse.
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